linux-kernel - Re: [PATCH] drivers: xen-blkfront: blkif

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Message-ID: <556C1834.8030606@oracle.com>
Date:	Mon, 01 Jun 2015 16:30:44 +0800
From:	Bob Liu <bob.liu@...cle.com>
To:	Roger Pau Monné <roger.pau@...rix.com>
CC:	xen-devel@...ts.xen.org, david.vrabel@...rix.com,
	justing@...ctralogic.com, konrad.wilk@...cle.com,
	paul.durrant@...rix.com, julien.grall@...rix.com,
	boris.ostrovsky@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: xen-blkfront: blkif_recover: recheck feature-persistent


On 06/01/2015 03:50 PM, Roger Pau Monné wrote:
> El 26/05/15 a les 2.11, Bob Liu ha escrit:
>> When migrate from !feature-persistent host to feature-persistent host, domU
>> still think new host/backend don't support persistent.
>> Dmesg like:
>> backed has not unmapped grant: 839
>> backed has not unmapped grant: 773
>> backed has not unmapped grant: 773
>> backed has not unmapped grant: 773
>> backed has not unmapped grant: 839
>>
>> We should recheck whether the new backend support feature-persistent during
>> blkif_recover().
> 
> Right, we recheck for indirect-descriptors but not persistent grants.
> 
> Do you think it makes sense to split the part of blkfront_connect that
> checks for optional features, like persistent grants, indirect
> descriptors and flush/barrier features to a separate function and call
> it from both blkfront_connect and blkif_recover?
> 

Yep, that would be better.

Thanks,
-Bob
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